Full Breakdown
Super El Niño Delays Ontario’s Fall Foliage
By Drooid · · How we work
Core Event
Scientists have labeled the current climate pattern the “Super El Niño,” the strongest El Niño on record. Its unusually warm autumn temperatures are expected to push back the onset of Ontario’s fall colour display by several weeks. The typical foliage window of mid-September to late October has been shifted later this season, according to climatologists.
Background on the “Super El Niño”
The phenomenon involves a massive surge of warm ocean water that intensifies global weather extremes. In Ontario, the pattern is producing warmer-than-normal days and milder nights, conditions that delay the cooling cue trees need to trigger colour change. Researchers note that while the summer was warm, it was not “excoriatingly” hot, allowing trees to retain leaves and begin the colour transition later than usual.
Expert Insights on Foliage Timing
Susan Dudley, a biology professor at McMaster University, explains that cooler nights normally cue the breakdown of chlorophyll, revealing yellow, orange and red pigments. With warmer nights, that cue is delayed, potentially resulting in a “slightly duller” colour palette because trees produce less anthocyanin, the pigment that acts like sunscreen. David Phillips, a climatologist with Environment and Climate Change Canada, observes that the province’s varied rainfall this summer has kept trees healthy, and the milder fall weather will let colour-seekers enjoy the display without shivering. He adds that reduced Atlantic hurricane activity this year, a side effect of El Niño, further supports a smoother foliage progression.
Verbatim Quotes
- “The red colour that we are really inspired by is actually the tree giving itself sunscreen as it takes away the chlorophyll molecules and the resources in chlorophyll,” — Susan Dudley, a biology professor at McMaster University in Hamilton
What Viewers Can Expect
Despite the delay, experts assure Ontarians that the foliage will still be vibrant. Algonquin Provincial Park’s latest report highlights sugar and red maples already “blazing” at canopy level. The extended warm period gives visitors a longer window to view the colours, whether in the Muskoka region, local parks, or backyards.
